Warning: Do not remove the radiator cap when the engine is hot, as escaping steam can cause severe burns. Cover the radiator cap with a thick rag and slowly unscrew the cap until you hear the steam escaping and hiss. Once the steam has stopped escaping, slowly unscrew and remove the cap from the radiator.
Removal
- Disconnect the cable from the negative battery terminal.
- Drain the coolant from the cooling system.
- Unscrew the bolts and remove the generator adjusting bar (Fig. 5.17).
- Remove the bolts and water pump.
Fig. 5.17. Water pump of the 4G1 engine: 1 - generator adjustment bar; 2 - water pump
Examination
- Inspect each part for cracks, damage or wear and replace the pump assembly if necessary.
- Turn the water pump shaft and check for smooth rotation and no noise.
- Check for coolant leaks from the pump. If there is a leak, the pump seal is faulty. Replace the water pump if necessary.
Installation
- Installation is carried out in the reverse order of removal, taking into account the following.
- Clean the mating surfaces of the water pump and cylinder block.
- Apply a 3.0 mm diameter bead of sealant to the water pump mating surface (Fig. 5.18).
Sealant: Mitsubishi Genuine Part # MD970389
Fig. 5.18. Places of application of sealant on the mating surface of the water pump
Install the water pump and secure it with bolts, remembering that the water pump bolts are of different lengths (Fig. 5.19).
Fig. 5.19. Location of water pump mounting bolts for vehicles with gasoline engines: 1 - bolt, 8x50; 2 - bolt, 8x25; 3 - bolt, 8x14; 4 - bolt, 8x30
- Install the generator adjustment bar and secure it with bolts, tightening them to the required torque.
- Install the timing belt to drive the gas distribution mechanism.
- Fill the cooling system with the required amount of the required coolant.
- Connect the cable to the negative terminal of the battery.
- Start the engine and check for leaks in the cooling system.
- Check the coolant level.